A coolant pump for an engine includes a pump case main body and a pump drive shaft journaled therein. The pump drive shaft has a plurality of blades mounted thereon and is rotatable about a pump drive shaft axis. The coolant pump also includes a partition member and a lid. The partition member and the pump case main body define a pump chamber configured to house the blades. The partition member also defines a pump chamber inlet port. A fluid inlet chamber is defined by the partition member and the lid. The fluid inlet chamber provides fluid communication between a fluid inlet port and the pump chamber inlet port.
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4. A coolant pump for an engine cooling system, the pump comprising:
a pump case main body, a pump drive shaft journaled in the pump case main body, the pump drive shaft being rotatable about a pump drive shaft axis, a plurality of blades mounted on the pump drive shaft;
a partition member comprising an upper portion and, the partition member and the pump case main body defining a pump chamber configured to house the blades, the partition member defining a pump chamber inlet port, the partition member further comprising a auxiliary passage that provides fluid communication between a fluid inlet chamber and the pump chamber;
a lid; and
the fluid inlet chamber defined by the partition member and the lid, the fluid inlet chamber providing fluid communication between a fluid inlet port and the pump chamber inlet port.
18. A coolant pump for an engine cooling system, the pump comprising:
a pump case main body, a pump drive shaft journaled in the pump case main body, the pump drive shaft being rotatable about a pump drive shaft axis, a plurality of blades mounted on the pump drive shaft, the pump case main body defining a first mounting surface;
a partition member comprising a pump chamber inlet port and a peripheral region, the peripheral region defining a second mounting surface and third mounting surface, the partition member and the pump case main body defining a pump chamber configured to house the blades;
a lid comprising a fourth mounting surface;
a fluid inlet chamber defined by the partition member and the lid, the fluid inlet chamber providing fluid communication between a fluid inlet port and the pump chamber inlet port;
wherein when assembled, the first mounting surface faces the second mounting surface and the third mounting surface faces the fourth mounting surface.
1. A snowmobile comprising:
a frame assembly;
an internal combustion engine mounted to the frame assembly, the internal combustion engine comprising:
a cylinder block defining a cylinder bore;
a crankcase connected to the cylinder block defining a crankcase chamber, the crankcase having a crankshaft journaled therein, the crankshaft rotatable about a crankshaft axis;
a piston reciprocally positioned in the cylinder bore, the piston driving the crankshaft; and
a cooling system having a centrifugal coolant pump, the centrifugal coolant pump located in the crankcase, the centrifugal coolant pump comprising:
a lid;
a pump case main body, a pump drive shaft journaled in the pump case main body, the pump drive shaft being rotatable about a pump drive shaft axis, a plurality of blades mounted on the pump drive shaft, at least a portion of the drive shaft being interposed between the cylinder block and the lid;
a partition member defining at least a portion of a pump chamber inlet port, the partition member and the pump case main body defining a pump chamber configured to house the blades; and
a fluid inlet chamber defined by the partition member and the lid, the fluid inlet chamber providing fluid communication between a fluid inlet port and the pump chamber inlet port.
2. A snowmobile comprising:
a frame assembly defining a longitudinal vertical plane and a transverse vertical plane;
an internal combustion engine mounted to the frame assembly generally along the transverse vertical plane, the internal combustion engine comprising:
a cylinder block defining a cylinder bore;
a crankcase connected to the cylinder block defining a crankcase chamber, the crankcase having a crankshaft journaled therein, the crankshaft rotatable about a crankshaft axis;
a piston reciprocally positioned in the cylinder bore, the piston driving the crankshaft; and
a cooling system having a centrifugal coolant pump, the centrifugal coolant pump located in the crankcase, the centrifugal coolant pump comprising:
a pump housing defining a pump chamber that is in fluid communication with a fluid inlet port, the pump housing comprising:
a pump case main body, the pump drive shaft journaled in the pump case main body;
a partition member comprising an upper portion and defining a pump chamber inlet port, the partition member and the pump case main body defining the pump chamber, the partition member further comprising a auxiliary passage that provides fluid communication between a fluid inlet chamber and the pump chamber;
a lid;
the fluid inlet chamber defined by the partition member and the lid, the fluid inlet chamber providing fluid communication between the fluid inlet port and the pump chamber inlet port; and
a pump drive shaft journaled in the pump housing, the pump drive shaft being rotatable about a pump drive shaft axis, the pump drive shaft having at least one blade mounted thereon, the blade positioned within the pump chamber;
wherein the fluid inlet port is offset from the pump drive shaft axis.
6. A snowmobile comprising:
a frame assembly defining a longitudinal vertical plane and a transverse vertical plane;
an internal combustion engine mounted to the frame assembly generally along the transverse vertical plane, the internal combustion engine comprising:
a cylinder block defining a cylinder bore;
a crankcase connected to the cylinder block defining a crankcase chamber, the crankcase having a crankshaft journaled therein, the crankshaft rotatable about a crankshaft axis;
a piston reciprocally positioned in the cylinder bore, the piston driving the crankshaft; and
a cooling system having a centrifugal coolant pump, the centrifugal coolant pump located in the crankcase, the centrifugal coolant pump comprising:
a pump housing comprising:
a pump case main body defining a first mounting surface;
a partition member defining a pump chamber inlet port and comprising a peripheral region defining a second mounting surface and a third mounting surface, the second and third mounting surfaces being on opposite sides of the partition member, the partition member and the pump case main body defining a pump chamber;
a lid defining a fourth mounting surface;
a fluid inlet chamber defined by the partition member and the lid, the fluid inlet chamber providing fluid communication between a fluid inlet port and the pump chamber inlet port; and
a pump drive shaft journaled in the pump case main body, the pump drive shaft being rotatable about a pump drive shaft axis, the pump drive shaft having at least one blade mounted thereon, the blade positioned within the pump chamber;
wherein the fluid inlet port is offset from the pump drive shaft axis, the first mounting surface faces the second mounting surface, and the third mounting surface faces the fourth mounting surface.
3. The snowmobile of
5. The coolant pump of
7. The snowmobile of
8. The snowmobile of
9. The snowmobile of
10. The coolant pump of
12. The snowmobile of
13. The snowmobile of
14. The snowmobile of
15. The snowmobile of
16. The snowmobile of
17. The snowmobile of
19. The coolant pump of
20. The coolant pump of
21. The coolant pump of
22. The coolant pump of
23. The coolant pump of
24. The coolant pump of
25. The coolant pump of
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This application is based upon and claims the priority of Japanese Patent Application No. 2001-072974, filed on Mar. 14, 2001.
1. Field of the Invention
The present invention generally relates to a cooling system for land vehicles. More specifically, the present invention relates to an improved coolant pump for snowmobiles that is more compact than conventional coolant pumps such that the overall engine and vehicle body can be made smaller.
2. Description of the Related Art
Snowmobiles are powered by internal combustion engines that are mounted within a substantially enclosed engine compartment forward of the rider's seat. The engine compartment typically is defined within a cowling and is generally relatively small. Although operated in a relatively cold environment, components of such engines often get quite hot. Accordingly, such engines often employ a cooling system.
One type of cooling system employed to maintain a reasonably cool running temperature is a liquid coolant cooling system. Such a system will often employ a coolant pump to circulate liquid coolant within the engine. One type of coolant pump is a centrifugal pump that has a fluid inlet port located on a lid. To accommodate the incoming fluid that flows through the fluid inlet port, the lid is sometimes provided with a protruding inlet conduit that extends away from the rest of the pump in one direction. The inlet conduit is then routed using a ninety degree bend so that the coolant flows toward the pump in a direction parallel to the plane of the lid. This arrangement is unsatisfactory because it results in a pump that is large in size. The relatively large size pump is unsatisfactory because it can interfere with other components that are mounted in the vicinity of the pump.
To avoid such interference, the size of the engine can be increased. However, the larger engine may not fit within the small engine compartment of the snowmobile or may interfere with other components of the snowmobile located forward of the seat.
Thus, a centrifugal pump that has a lower profile and that therefore takes up less space in the engine body and in the engine compartment is desired.
Accordingly, one aspect of the present invention involves a snowmobile that has a frame assembly and an internal combustion engine. The frame assembly defines an imaginary longitudinal vertical plane and an imaginary transverse vertical plane. The internal combustion engine is mounted to the frame assembly generally along the transverse vertical plane. The internal combustion engine has a cylinder block defining a cylinder bore and a crankcase connected to the cylinder block. The crankcase defines a crankcase chamber. The crankcase has a crankshaft journaled therein. The crankshaft is rotatable about a crankshaft axis. A piston is reciprocally positioned in the cylinder bore and drives the crankshaft. A cooling system includes a centrifugal coolant pump. The coolant pump is located in the crankcase and has a coolant pump housing that defines a pump chamber. The pump chamber is in fluid communication with a fluid inlet port. A pump drive shaft is journaled in the pump housing. The pump drive shaft has at least one blade mounted thereon. The blade is positioned within the pump chamber. The pump drive shaft is rotatable about a pump drive shaft axis. The fluid inlet port is offset from the pump drive shaft axis.
Another aspect of the present invention involves a coolant pump for an engine cooling system. The coolant pump includes a pump case main body and a pump drive shaft journaled in the pump case main body. The pump drive shaft has a plurality of blades mounted thereon and is rotatable about a pump drive shaft axis. The coolant pump also includes a partition member and a lid. The partition member has an upper portion. The partition member and the pump case main body define a pump chamber configured to house the blades. The partition member also defines a pump chamber inlet port. A fluid inlet chamber is defined by the partition member and the lid. The fluid inlet chamber provides fluid communication between a fluid inlet port and the pump chamber inlet port.
These and other features, aspects and advantages of the present invention will be better understood with reference a preferred embodiment, which is illustrated in the accompanying drawings. The illustrated embodiment is merely exemplary and is not intended to define the outer limits of the scope of the present invention. The drawings of the illustrated arrangement comprise thirteen figures.
With reference now to
The snowmobile 20 generally comprises a frame assembly 22 (see
A windshield 30 is disposed over a mid-portion of the body cover 24. The windshield 30 provides some degree of protection for the riders from wind and other elements during operation of the snowmobile 20. Rearward of the windshield 30, a fuel tank 32 is mounted to the frame assembly 22 in a manner that allows the body cover 24 and the fuel tank 32 to blend together for aesthetic reasons.
Rearward of the fuel tank 32, a seat 34 is mounted to the frame assembly 22. A right-side step, or foot-rest 36, is attached to the right-hand side of the frame 22 of the snowmobile 20. A left-side step, or foot-rest 38, is attached to the left-hand side of the frame 22 of the snowmobile 20. As used herein, “right,” “right-hand,” “right-side,” “left,” “left-hand,” and “left-side” are defined from the perspective of a rider on the seat 34 facing forward. Rearward of the seat 34 is positioned a grab bar 39 that comprises a grabbing portion 41 that can be used to raise a rear portion of the snowmobile for turning and maneuvering when the snowmobile is not being ridden. While the illustrated grab bar 39 is generally U-shaped and is mounted in a generally horizontal manner, other forms of grab bars can be used. For instance, the grab bar 39 can be loops, semicircular, vertical or inclined in orientation. In short, any suitable grab bar construction can be used.
Forward of the seat 34 and the fuel tank 32 is a steering handle assembly 42. The handle assembly 42 can carry appropriate controls and can be coupled to a pair of front skis 44. Manipulation of the handle assembly 42 causes the direction of the snowmobile 20 to be altered in a known manner. The skis 44 are mounted to the frame assembly 22 though a front suspension assembly 46. Any suitable front suspension assembly 46 can be used.
The engine 28 in the illustrated arrangement is an inclined L-4 four-cycle engine that is mounted transversely within the engine compartment 26. In other words, the illustrated engine 28 comprises four cylinder bores that extend side-by-side across a width of the snowmobile 20. The cylinder bores each comprise a center axis O that is inclined relative to vertical. In some arrangements, engines having differing numbers of cylinder bores, different cylinder bore configurations (e.g., V, opposing, etc.), different orientations (e.g., vertical) and different operating principles (e.g., two-stroke, rotary, etc.) can be used.
The engine 28 also comprises an output shaft 50. The output shaft 50 drives a transmission, which is a continuously variable transmission 52 in the illustrated arrangement. Other transmissions also can be used. In the illustrated arrangement, the output shaft 50 rotates a drive pulley 54. The output shaft 50 and the drive pulley 54 can be connected together through a clutch, a centrifugal clutch, a sprag clutch or can be directly connected together.
The drive pulley 54 powers a driven pulley 56 with a v-belt 58 in the illustrated arrangement. In some configurations, a drive chain can be used in place of the v-belt 58. Other arrangements also can be used. The driven pulley 56 is connected to and rotates about a transfer shaft 60. In the illustrated arrangement, the transfer shaft 60 carries a sprocket (not shown) at the end opposite to the driven pulley 56. The sprocket is connected to a further sprocket that is carried by a drive shaft 62.
The drive shaft 62 powers a drive unit 64. The drive unit 64 generally comprises a plurality of drive wheels 68. The drive wheels 68 provide a motive force to a drive belt 70, which is commonly used in the snowmobile industry.
With continued reference to
Many of the above-described components are generally conventional and can be arranged and configured in any suitable manner. Additionally, the above-described components can be replaced by other suitable components where desired. Any details omitted to this point have been considered well within the design knowledge of those of ordinary skill in the art.
With continued reference to
The air also is drawn into an air intake box 92. The air intake box 92 is disposed forward of the engine 28 in the illustrated arrangement. The air intake box 92 can be mounted to the frame assembly 22 in any suitable manner. An air inlet 93 into the air intake box 92 can extend upward into a lower surface of the air intake box 92.
A set of intake runners 94 extends between the illustrated air intake box 92 and the engine 28. Preferably, a charge former 96 is disposed along each of the intake runners 94. Advantageously, the intake runners 94 extend directly rearward to the engine 28 rather than wrapping around the engine 28 and mating with a rearward-facing surface of the engine 28. The charge formers 96 preferably correspond to each cylinder bore. In some arrangements, a single charge former can be used upstream of a separation point for runners extending to individual cylinder bores. In addition, in the illustrated arrangement, the engine 28 is carbureted. In some arrangements, the charge formers 96 can be fuel injectors that are mounted for direct injection, indirect injection or port injection. The air-fuel charge provided in this manner is combusted in a conventional manner, e.g., by spark plugs 99 (see FIG. 2).
The combustion byproducts then are exhausted through a suitable exhaust system 100. In the illustrated arrangement, the exhaust system 100 extends directly rearward from the engine 28. In this manner, an exhaust runner 102 that extends rearward from the engine can be tuned to the engine for improved engine performance. Additionally, the length of each runner 102 can be lengthened prior to merging together with any other runners such that pulse effects on adjoining cylinder bores can be reduced. In some arrangements, an attenuation chamber or passage between two or more runners can be used to reduce the effect of reflected pressure pulses in the exhaust system.
With continued reference to
The manifold pipes 116 extend rearward to a silencer box 118. The silencer box 118 provides an enlarged volume into which the exhaust can flow. Exhaust energy is dissipated within the silencer box 118 and the noise level of the exhaust can be decreased. In the illustrated arrangement, the silencer box 118 is disposed below a portion of the seat 34 that is rearward of a rider section 121 of the seat.
A pair of exhaust pipes 120 extends rearward from the silencer box 118. In some arrangements, a single exhaust pipe 120 can extend from the silencer box 118. Other numbers of exhaust pipes also can be used. One end of each of the exhaust pipes 120 preferably defines an ultimate exhaust discharge 122 from the snowmobile 20 such that the exhaust gases are discharged into the atmosphere at this location. As illustrated in
With reference now to
The engine 28 also includes a crankshaft 216 and an auxiliary shaft 224. The crankshaft 216 is journaled in the crankcase member 212 and is rotatably coupled to the pistons, e.g., through a connecting rod. The output shaft 50 is rotatably coupled to the crankshaft 216 in a suitable manner, e.g., through a gear pair mounted proximate a lateral side of the engine 28. Rotational motion of the crankshaft 216 is thus transmitted to the output shaft 50 and through the transmission 52 to the drive belt 70 of the snowmobile 20 to provide motive force for the snowmobile 20. A crankshaft cover 228 is provided on the lateral side of the crankcase member 212 of the engine 28. The crankshaft cover 228 covers the crankshaft 216 and the members, e.g., the gears, that roatably couple the crankshaft 216 and the output shaft 50.
The auxiliary shaft 224, in one embodiment, is also journaled in the crankcase member 212. In one embodiment, the auxiliary shaft 224 is rotatably coupled to the output shaft 50. The auxiliary shaft 224 drives a coolant pump 304 in one embodiment. One embodiment of the cooling pump 304 is discussed in greater detail in connection with a cooling system 300 illustrated in
In one embodiment, several other components of the engine 28 are located on or near the forward facing side of the crankcase 212. A lubricant pump housing 229 is provided at an elevation that is generally below the output shaft 50. The lubricant pump housing 229 is configured to enclose the lubricant pump unit (not shown). In one embodiment, a coolant pump housing 232 is provided adjacent to the lubricant pump housing 229 to at least partially house the coolant pump 304. In one embodiment, a coolant pump housing cover 236 is provided on one side of the crankcase 212 to enclose at least the coolant pump 304 and the auxiliary shaft 224. A lubricant filter 240 and a lubricant cooler 244 are also mounted on a forward facing side of the engine 28.
With reference now to
A first cooling system branch begins at the outlet port 312 and includes a coolant passage 316 that extends between the outlet port 312 and the engine 28. A portion of the coolant supplied by the coolant pump 304 is provided through the coolant passage 316 and is circulated through the engine body to cool various components thereof. A plurality of coolant passages 320 extend between the engine 28 and a coolant merge passage 324. The coolant merge passage 324 is connected to a temperature regulator 328 through which the coolant in the cooling system 300 flows. A coolant passage 332 extends between the temperature regulator 328 and the inlet port 308 of the coolant pump 304. When the engine 28 is first started and is, therefore, cold, most of the coolant is circulated through this first branch of the cooling system 300. As the temperature of the engine 28 rises, at least a portion of the coolant is circulated through a second coolant branch.
The second coolant branch includes a coolant supply, such as the coolant tank 336, a right-side heat exchanger 340, a left-side heat exchanger 344, the coolant pump 304, and coolant passages interconnecting each of these components. A coolant passage 348 that extends between the temperature regulator 328 and the coolant tank 336 carries coolant from the first coolant branch to the coolant tank 336. A coolant passage 352 that extends between the coolant tank 336 and the right-side heat exchanger 340 carries coolant to the heat exchanger 340. In one embodiment, the heat exchanger 340 is at least partially located proximate the right-side step 36. The heat exchanger 340 removes heat from the coolant in a known manner. A coolant passage 356 that extends between the right-side heat exchanger 340 and the left-side heat exchanger 344 carries coolant to the left-side heat exchanger 344. In one embodiment, the left-side heat exchanger 344 is located at least partially proximate the left-side step 38. As with the right-side heat exchanger 340, the left-side heat exchanger 344 removes heat from the coolant flowing therethrough. A coolant passage 360 extends between the left-side heat exchanger 344 and the inlet port 308 of the coolant pump 304 to carry coolant back to the coolant pump 304 for further circulation through the engine 28 and associated components.
In one embodiment, a third coolant branch is provided in the cooling system 300 to cool the lubricant that is circulated through the lubrication system of the engine. A coolant passage 364 branches off from the coolant passage 316 and extends to an inlet side of the lubricant cooler 244. A coolant passage 368 extends from an outlet side of the lubricant cooler 244 to the temperature regulator 328 and connects thereto. A portion of the coolant from the coolant pump 304 is delivered into the coolant passage 364. This coolant flows through the lubricant cooler 244, which includes a heat exchanger to transfer heat from the lubricant in the lubrication system to the coolant. In some running conditions, the lubricant can be warmed by the coolant flowing therethrough. After flowing through the lubricant cooler 244, the coolant is carried by the coolant passage 368 back to the temperature regulator 328 for further circulation in the cooling system.
In one embodiment, the cooling system 300 includes another branch that communicates with the charge former 96. A coolant passage 376 branches off from the coolant merge passage 324 and connects to an inlet side of a heat exchanger associated with the charge former 96. A coolant passage 380 extends from an outlet side of the heat exchanger associated with the charge former 96 to a secondary inlet 384 of the coolant pump 304. An auxiliary temperature regulator 388 is provided proximate the coolant passage 376 to control the flow of coolant therein.
With reference to
With reference to
With reference to
The pump case main body 504 and the partition member 514 define a pump chamber 520. The pump chamber 520 includes a pump chamber inlet port 524. A plurality of blades 528 are mounted on the drive shaft 508 and are housed within the pump chamber 520. The embodiment shown includes six blades 528. One skilled in the art will recognize that more or less blades can be used within the scope of the claims below.
The partition member 514 and the lid 512 define a fluid inlet chamber 532. The fluid inlet chamber 532 is in fluid communication with the fluid inlet port 516 through a first opening 536 in the partition member 514. The fluid inlet chamber 532 is also in fluid communication with the pump chamber inlet port 524 through a second opening 540 in the partition member 514.
In one embodiment, the pump case main body 504, the partition member 514, and the lid 512 are secured together. These components can be secured together in a conventional manner, e.g., by one or more bolts 548. Preferably, when the pump case main body 504, the partition member 514, and the lid 512 are assembled, a water-tight seal is formed around the perimeter of the pump 304. In one embodiment, such a seal is achieved by positioning a first O-ring 550 between the partition member 514 and the pump case main body 504 proximate the outer perimeter of the pump 304 and by positioning a second O-ring 551 between the partition member 514 and the lid 512 proximate the outer perimeter of the pump 304.
With reference to
In one embodiment, the lid 512 also includes a secondary fluid inlet 560. The fluid inlet 560 communicates with the fluid inlet chamber 532 in one embodiment. In one embodiment, the secondary inlet 560 is similar to the inlet 384 described above in connection with the cooling system 300.
In another embodiment, the pump 304 includes a coolant drain 564. One arrangement of a coolant drain 564 provides a passage that extends downward from the pump chamber 520. The passage is sealed, in part, by a bolt 568. To drain the pump chamber 520 of the pump 304, the bolt 568 is removed. It should be recognized that other shapes of the coolant drain 564 are possible so long as fluid communication is provided between the pump chamber 520 and the atmosphere. In another embodiment, the coolant drain 564 could provide for fluid communication between the fluid inlet chamber and the atmosphere.
Although the present invention has been described in terms of a certain embodiment, other embodiments apparent to those of ordinary skill in the art also are within the scope of this invention. Thus, various changes and modifications may be made without departing from the spirit and scope of the invention. For instance, various components may be repositioned as desired. Moreover, not all of the features, aspects and advantages are necessarily required to practice the present invention. Accordingly, the scope of the present invention is intended to be defined only by the claims that follow.
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
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Mar 13 2002 | ATSUUMI, MAMORU | Yamaha Hatsudoki Kabushiki Kaisha | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 012706 | /0280 |
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